気象庁ホームページで使用されている、geojson等の地理情報を紹介します
記事作成時に確認した範囲の情報です。仕様変更などの可能性もありますのでご了承ください
地域に関するデータ
「1次細分区域」「市町村等をまとめた地域」「2次細分区域」の詳細な説明は 過去の記事を参照ください
1次細分区域(class10s.json)
各府県の「北部」「南部」などの地域のgeojsonデータは https://www.jma.go.jp/bosai/common/const/geojson/class10s.json に格納されています
{
"type": "FeatureCollection",
"features": [
{
"type": "Feature",
"geometry": {
"type": "MultiPolygon",
"coordinates": [
[
[
[ 141.9412, 45.5215],
[ 141.979, 45.4742],......
]
]
]
},
"properties": {
"code": "011000",
"name": "宗谷地方",
"enName": "Soya Region"
}
},......
],......
}
nameは1次細分区域名ではなく都道府県名のため、注意が必要です(1次細分区域名をプロットしたい場合には、後に取り上げる area.json と組み合わせて使用する必要があります)
まとめた地域(class15s.json)
1次細分区域をさらに分割した地域(東京なら「23区西部」「23区東部」など)を表す「市町村等をまとめた地域」のgeojsonデータは https://www.jma.go.jp/bosai/common/const/geojson/class15s.json に格納されています
(ファイル名以外class10s.jsonと同様のため例は省略)
2次細分区域(class20s_{i}.json)
おおむね市町村を表す、2次細分区域のgeojsonデータは https://www.jma.go.jp/bosai/common/const/geojson/class20s_{i}.json に格納されています。(ファイル名以外class10s.jsonとほぼ同様のため例は省略)
{i}は0から9の番号です。どの緯度経度でどのデータを取得すればいいかは、次の relm.json に記載されています。
なお、1次細分区域についても同様の高精細なgeojsonデータ(class10s_{i}.json)が存在します。同様に、土砂災害警戒情報の発表地域を表す landslides_{i}.json というデータも存在します(2026年5月の防災気象情報の体系整理で2次細分区域と統一されるため、今後使用する機会はないと思われます)
詳細な地域データの分割境界の情報(relm.json)
2次細分区域(・1次細分区域・土砂災害警戒情報の発表地域)の地域データは、10の地域に分けて格納されています。どの緯度経度になったらどのデータが必要かという情報は https://www.jma.go.jp/bosai/common/const/relm.json に格納されています
[
{"ne":[45.5569,148.8922],"sw":[41.3521,139.3344]}, // 0 北海道
{"ne":[41.5559,142.0725],"sw":[38.7478,139.6932]}, // 1 北東北
{"ne":[39.2086,141.6747],"sw":[36.7365,137.635]}, // 2 南東北・新潟
{"ne":[37.1543,153.9864],"sw":[24.2254,138.3971]}, // 3 関東
{"ne":[37.8553,139.1766],"sw":[34.5781,136.2439]}, // 4 北陸東海甲信
{"ne":[36.2953,136.9877],"sw":[33.433,134.2527]}, // 5 近畿福井三重
{"ne":[37.2429,134.8208],"sw":[32.7025,131.668]}, // 6 中国四国
{"ne":[34.7987,132.4913],"sw":[31.9887,128.3437]}, // 7 山口・九州北部
{"ne":[33.1944,131.8857],"sw":[27.0187,128.3955]}, // 8 九州南部
{"ne":[27.8853,131.3312],"sw":[24.0456,122.9337]} // 9 沖縄
]
0番目が class20s_0.json の担当範囲、1番目がclass20s_1.json の担当範囲… です
気象分野で用いる地域の情報(area.json)
気象分野で用いる 地方＞府県＞1次細分区域＞まとめた地域＞2次細分区域(≒市町村) の名称や包含関係は https://www.jma.go.jp/bosai/common/const/area.json に格納されています
{
......
"offices": {
"100000": {
"name": "群馬県",
"enName": "Gunma",
"officeName": "前橋地方気象台",
"parent": "010300",
"children": [ "100010", "100020"]
},
"110000": {
"name": "埼玉県",
"enName": "Saitama",
"officeName": "熊谷地方気象台",
"parent": "010300",
"children": [ "110010", "110020", "110030"]
},......
},......
}
nameに名称、parentとchildrenに包含関係が記載されています
海域(marines.json)
海上警報で用いられる地域のgeojsonデータは https://www.jma.go.jp/bosai/common/const/geojson/marines.json に格納されています
{
"type": "FeatureCollection",
"features": [
{
"type": "Feature",
"geometry": {
"type": "MultiPolygon",
"coordinates": [
[
[
[ 143.7108, 50.53],
[ 147.0, 49.7],......
],......
],......
]
},
"properties": {
"code": "1010",
"name": "サハリン東方海上",
"enName": "SEA EAST OF SAKHALIN"
}
},......
]
}
地震の地域(earthquake.json)
震度速報などで用いられる地域のgeojsonデータは https://www.jma.go.jp/bosai/common/const/geojson/earthquake.json に格納されています
{
"type": "FeatureCollection",
"features": [
{
"type": "Feature",
"geometry": {
"type": "MultiPolygon",
"coordinates": [
[
[
[ 141.4039, 43.7378],
[ 141.4173, 43.7112],......
],......
],......
]
},
"properties": {
"code": "100"
}
},......
]
}
格納されている情報はポリゴンの緯度経度と地域コードのみで、地域名は格納されていないため、地域名等を表示する際は地震情報の電文と合わせて利用する必要がありそうです
津波の地域(tsunami.json)
津波警報などで用いられる地域のgeojsonデータは https://www.jma.go.jp/bosai/common/const/geojson/tsunami.json に格納されています
{
"type": "FeatureCollection",
"features": [
{
"type": "Feature",
"geometry": {
"type": "MultiLineString",
"coordinates": [
[
[ 145.5976, 43.2217],
[ 145.609, 43.2112],......
],......
]
},
"properties": {
"code": "100"
}
},......
]
}
地震情報同様、地域名は格納されていないため、地域名等を表示する際は津波警報等の電文と合わせて利用する必要がありそうです
地点に関するデータ
地方／都道府県／市町村の中心位置(xy.json)
各地方／都道府県／市町村(2次細分区域)の中心位置が https://www.jma.go.jp/bosai/common/const/xy.json に格納されています
県庁や市役所、気象官署の位置というわけではなく、位置的に各地域のおおむね真ん中辺りの位置が指定されています
おそらく あなたの街の防災情報等のページでどの位置にズームするかを判定するのに使用しているのかなと想像します(未検証)
{
"offices": {
"100000": [ 36.4853, 138.9971],
"110000": [ 36.0034, 139.3614],
......
"hoppo": [ 45.0743, 147.8582]
},
"class20s": {
"1020100": [ 36.4366, 139.1324],
"1020200": [ 36.3786, 138.9026],
......
"hoppo": [ 45.0743, 147.8582]
},
"centers": {
"010100": [ 43.3979, 142.566],
"010200": [ 39.0916, 140.6649],
......
"hoppo": [ 45.1243, 147.8582]
}
}
アメダス(amedastable.json)
各アメダスの位置や名称は https://www.jma.go.jp/bosai/amedas/const/amedastable.json に格納されています
{
"11001": {
"type": "C",
"elems": "11112010",
"lat": [ 45, 31.2],
"lon": [ 141, 56.1],
"alt": 26,
"kjName": "宗谷岬",
"knName": "ソウヤミサキ",
"enName": "Cape Soya"
},
"11016": {
"type": "A",
"elems": "11111111",
"lat": [ 45, 24.9],
"lon": [ 141, 40.7],
"alt": 3,
"kjName": "稚内",
"knName": "ワッカナイ",
"enName": "Wakkanai"
},......
}
緯度経度は度分表記で表されます。typeやelemsの意味等詳しくは過去の記事をご覧ください
火山の位置(volcano_list.json)
気象庁が情報を発表している活火山の位置は https://www.jma.go.jp/bosai/volcano/const/volcano_list.json に保存されています
[
{
"code": "101",
"latlon": [ "44.133", "145.161" ],
"pointShift": [ 0, -15],
"pointShift18": [ 0, -20],
"name_jp": "知床硫黄山",
"name_en": "Shiretoko-Iozan"
},
{
"code": "102",
"latlon": [ "44.076", "145.122" ],
"pointShift": [-22, 0],
"pointShift18": [-37, 0],
"name_jp": "羅臼岳",
"name_en": "Rausudake"
},......
]
緯度経度はなぜか文字列で格納されていますので、何らか計算して利用するような場合は注意してください。おそらく他の山と文字が被らないようにするための pointShift pointShift18 が定義されています
各種地図の表示サンプルページ
以上に列挙した地図を、leaflet.jsを利用して描画するサンプルページです
サンプルページのソースコード
<!DOCTYPE html>
<html lang="ja">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>地図</title>
<!-- https://leafletjs.com/ -->
<link rel="stylesheet" href="https://unpkg.com/leaflet@1.9.4/dist/leaflet.css"
integrity="sha256-p4NxAoJBhIIN+hmNHrzRCf9tD/miZyoHS5obTRR9BMY="
crossorigin=""/>
<script src="https://unpkg.com/leaflet@1.9.4/dist/leaflet.js"
integrity="sha256-20nQCchB9co0qIjJZRGuk2/Z9VM+kNiyxNV1lvTlZBo="
crossorigin=""></script>
<style>
*{ font-family:sans-serif;}
html, body{ width:100%; height:100%; margin:0; overflow:hidden;}
body{ display:flex; flex-direction:column;}
div#menu{ flex:0.01;}
div#map{ flex:1; background:#3b4580;}
.icon{ text-align:center; font-size:14px;}
.textWhite{ color:white; font-weight:bold;}
.borderBlack{ text-shadow:1px 1px 0 #000, -1px -1px 0 #000, -1px 1px 0 #000, 1px -1px 0 #000;}
</style>
</head>
<body>
<div id="menu">
<select id="elem">
<option value="none">(なし)</option>
<option value="amedas">アメダス</option>
<option value="areaLimits">詳細な地域データの分割境界</option>
<option value="areaCenters">都道府県・市町村の中心位置</option>
<option value="class10s">1次細分区域</option>
<option value="class15s">市町村等をまとめた地域</option>
<option value="class20s">2次細分区域(拡大してください)</option>
<option value="seaAreas">海上警報の地域</option>
<option value="quakeAreas">震度速報等で用いる地域</option>
<option value="tsunamiCoasts">津波警報等で用いる地域</option>
<option value="volcanoes">火山</option>
</select>
</div>
<div id="map"></div>
<script>
"use strict";
let globals = {"class20s":{}}, layers = {};
let map = L.map('map').setView([35, 135], 5);
initialize();
// 地図の表示
function initialize(){
const panes = {"paneM1":-10,"paneM2":-20,"paneM3":-30}
for( let pane in panes){
map.createPane(pane).style.zIndex = panes[pane];
}
const jmaAttr = '<a href="https://www.jma.go.jp/jma/kishou/info/coment.html" target="_blank">気象庁</a>';
const gsiAttr = '<a href="https://maps.gsi.go.jp/development/ichiran.html" target="_blank">国土地理院</a>';
L.control.layers({
"(なし)":L.tileLayer('./images/blank.png', { maxNativeZoom:18, maxZoom:18, minZoom:1, attribution:jmaAttr, pane:"paneM2"}),
"気象庁地図(灰色)":L.tileLayer('https://www.jma.go.jp/tile/jma/gray-cities/{z}/{x}/{y}.png', { maxNativeZoom:11, maxZoom:18, minZoom:2, attribution:jmaAttr, pane:"paneM2"}).addTo(map),
"気象庁地図(緑色)":L.tileLayer('https://www.jma.go.jp/tile/jma/green-cities/{z}/{x}/{y}.png', { maxNativeZoom:10, maxZoom:18, minZoom:2, attribution:jmaAttr, pane:"paneM2"}),
"地理院地図(白地図)":L.tileLayer('https://cyberjapandata.gsi.go.jp/xyz/blank/{z}/{x}/{y}.png', { maxNativeZoom:14, maxZoom:18, minZoom:5, attribution:gsiAttr, pane:"paneM2"}),
"地理院地図(陰影起伏図)":L.tileLayer('https://cyberjapandata.gsi.go.jp/xyz/hillshademap/{z}/{x}/{y}.png', { maxNativeZoom:16, maxZoom:18, minZoom:4, attribution:gsiAttr, pane:"paneM2"}),
"地理院地図(標準地図)":L.tileLayer('https://cyberjapandata.gsi.go.jp/xyz/std/{z}/{x}/{y}.png', { maxNativeZoom:18, maxZoom:18, minZoom:4, attribution:gsiAttr, pane:"paneM2"}),
"地理院地図(淡色)":L.tileLayer('https://cyberjapandata.gsi.go.jp/xyz/pale/{z}/{x}/{y}.png', { maxNativeZoom:18, maxZoom:18, minZoom:4, attribution:gsiAttr, pane:"paneM2"}),
"地理院地図(英語)":L.tileLayer('https://cyberjapandata.gsi.go.jp/xyz/english/{z}/{x}/{y}.png', { maxNativeZoom:11, maxZoom:18, minZoom:4, attribution:gsiAttr, pane:"paneM2"}),
"地理院地図(写真)":L.tileLayer('https://cyberjapandata.gsi.go.jp/xyz/seamlessphoto/{z}/{x}/{y}.jpg', { maxNativeZoom:18, maxZoom:18, minZoom:4, attribution:'<a href="https://maps.gsi.go.jp/development/ichiran.html" target="_blank">国土地理院</a>', pane:"paneM2"}),
"地理院地図(色別標高)":L.tileLayer('https://cyberjapandata.gsi.go.jp/xyz/relief/{z}/{x}/{y}.png', { maxNativeZoom:15, maxZoom:18, minZoom:4, attribution:gsiAttr, pane:"paneM2"}),
"赤色立体":L.tileLayer('https://cyberjapandata.gsi.go.jp/xyz/sekishoku/{z}/{x}/{y}.png', { maxNativeZoom:14, maxZoom:18, minZoom:4, attribution:'<a href="https://maps.gsi.go.jp/development/ichiran.html" target="_blank">(株)アジア航測 | 国土地理院</a>', pane:"paneM2"}),
"地質図":L.tileLayer('https://gbank.gsj.jp/seamless/v2/api/1.2/tiles/{z}/{y}/{x}.png', { maxNativeZoom:13, maxZoom:18, minZoom:4, attribution:'<a href="https://maps.gsi.go.jp/development/ichiran.html" target="_blank">産総研 | 国土地理院</a>', pane:"paneM2"}),
"OpenStreetMap":L.tileLayer('https://tile.openstreetmap.org/{z}/{x}/{y}.png', { maxNativeZoom:18, maxZoom:18, minZoom:4, attribution:'c <a href="http://osm.org/copyright">OpenStreetMap</a> contributors, <a href="http://creativecommons.org/licenses/by-sa/2.0/">CC-BY-SA</a>', pane:"paneM2"})
},{
"行政界(レーダー)":L.tileLayer('https://www.jma.go.jp/bosai/jmatile/data/map/none/none/none/surf/mask/{z}/{x}/{y}.png', { maxNativeZoom:14, maxZoom:18, minZoom:3, attribution:jmaAttr, pane:"paneM1"}),
"行政界(気象)":L.tileLayer('https://www.jma.go.jp/tile/jma/base/{z}/{x}/{y}.png', { maxNativeZoom:11, maxZoom:18, minZoom:2, attribution:jmaAttr, pane:"paneM1"}),
"行政界(地震)":L.tileLayer('https://www.jma.go.jp/tile/jma/transparent-cities/{z}/{x}/{y}.png', { maxNativeZoom:11, maxZoom:18, minZoom:2, attribution:jmaAttr, pane:"paneM1"}),
"行政界(衛星)":L.tileLayer('https://www.jma.go.jp/tile/jma/sat/{z}/{x}/{y}.png', { maxNativeZoom:6, maxZoom:18, minZoom:2, attribution:jmaAttr, pane:"paneM1"}),
}).addTo(map);
getPolygons();
}
function getPolygons(){
let promises = [];
let urls = {
"amedas":"https://www.jma.go.jp/bosai/amedas/const/amedastable.json",
"areas":"https://www.jma.go.jp/bosai/common/const/area.json",
"areaLimits":"https://www.jma.go.jp/bosai/common/const/relm.json",
"areaCenters":"https://www.jma.go.jp/bosai/common/const/xy.json",
"class10s":"https://www.jma.go.jp/bosai/common/const/geojson/class10s.json",
"class15s":"https://www.jma.go.jp/bosai/common/const/geojson/class15s.json",
"seaAreas":"https://www.jma.go.jp/bosai/common/const/geojson/marines.json",
"quakeAreas":"https://www.jma.go.jp/bosai/common/const/geojson/earthquake.json",
"tsunamiCoasts":"https://www.jma.go.jp/bosai/common/const/geojson/tsunami.json",
"volcanoes":"https://www.jma.go.jp/bosai/volcano/const/volcano_list.json"
};
for( let elemName in urls){
promises.push(
new Promise((resolve, reject) => {
fetch(urls[elemName])
.then((response) => response.json())
.then((response) => {
globals[elemName] = response;
resolve(elemName);
});
})
);
}
Promise.allSettled(promises).then((values) => {
globals['areas']['quakeAreas'] = 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makeLayers();
});
}
function makeLayers( report){
layers['amedas'] = L.layerGroup();
for( let amedasCode in globals['amedas']){
let amedas = globals['amedas'][amedasCode];
let name = amedas['kjName'];
let ruby = amedas['knName'];
let lat = amedas['lat'][0] + amedas['lat'][1]/60;
let lon = amedas['lon'][0] + amedas['lon'][1]/60;
let icon = L.divIcon({
html:"●<br><ruby>" + name + "<rt>" + ruby + "</rt></ruby>",
iconSize: [80,30], iconAnchor: [40,10], className:'icon textWhite borderBlack'
});
let marker = L.marker( [lat,lon], {icon:icon});
layers['amedas'].addLayer( marker);
}
layers['areaLimits'] = L.layerGroup();
for( let i in globals['areaLimits']){
let areaLimit = globals['areaLimits'][i];
let nn = areaLimit['ne'][0], ee = areaLimit['ne'][1], ss = areaLimit['sw'][0], ww = areaLimit['sw'][1];
let polygon = L.polygon([[nn,ww],[nn,ee],[ss,ee],[ss,ww],[nn,ww]],{color:'#005aff'});
layers['areaLimits'].addLayer( polygon);
let lat = (nn + ss) / 2, lon = (ee + ww) / 2;
let icon = L.divIcon({
html:i,
iconSize: [80,30], iconAnchor: [40,10], className:'icon textWhite'
});
let marker = L.marker( [lat,lon], {icon:icon});
layers['areaLimits'].addLayer( marker);
}
layers['areaCenters'] = {};
for( let areaType in globals['areaCenters']){
layers['areaCenters'][areaType] = L.layerGroup();
for( let areaCode in globals['areaCenters'][areaType]){
let areaName = "";
try{
areaName = globals['areas'][areaType][areaCode]['name'];
let kana = globals['areas'][areaType][areaCode]['kana'];
if( kana!=undefined){
areaName = "<ruby>" + areaName + "<rt>" + kana + "</rt></ruby>";
}
}catch(e){
console.log( areaType, areaCode, e);
}
let latlon = globals['areaCenters'][areaType][areaCode];
let icon = L.divIcon({
html:areaName,
iconSize: [160,30], iconAnchor: [80,10], className:'icon textWhite borderBlack'
});
let marker = L.marker( latlon, {icon:icon});
layers['areaCenters'][areaType].addLayer( marker);
}
}
for( let areaType of ['class10s','class15s','seaAreas','quakeAreas','tsunamiCoasts']){
layers[areaType] = L.layerGroup();
let polygons =
L.geoJSON(globals[areaType], {
style:function (feature){
if( areaType=="tsunamiCoasts"){
return {color:globals['areas'][areaType][feature.properties.code]['color']};
}else{
return {color:'#005aff'};
}
}
}).bindPopup(function (layer) {
const areaCode = layer.feature.properties.code;
if( globals['areas'][areaType][areaCode]==undefined){
return layer.feature.properties.name;
}else{
return globals['areas'][areaType][areaCode]['name'];
}
});
layers[areaType].addLayer( polygons);
for( let feature of globals[areaType]['features']){
let lat = 0, lon = 0, nn = -Infinity, ss = Infinity, ww = Infinity, ee = -Infinity, count = 0, areaName = feature['properties']['name'], areaCode = feature['properties']['code'];
if( globals['areas'][areaType]!=undefined && globals['areas'][areaType][areaCode]!=undefined){
areaName = globals['areas'][areaType][areaCode]['name'];
}
for( let coordinates of feature['geometry']['coordinates']){
for( let coordinate of coordinates){
for( let coord of coordinate){
let lat0 = coord[1], lon0 = coord[0];
if( !Array.isArray(coord)){
lat0 = coordinate[1];
lon0 = coordinate[0];
}
lat += lat0;
lon += lon0;
nn = Math.max( nn, lat0);
ss = Math.min( ss, lat0);
ww = Math.min( ww, lon0);
ee = Math.max( ee, lon0);
count++;
}
}
}
let latlon = [lat/count, lon/count];
if( areaType=="seaAreas"){
latlon = [(nn+ss)/2, (ww+ee)/2];
}
let icon = L.divIcon({
html:areaName,
iconSize: [120,30], iconAnchor: [60,10], className:'icon textWhite borderBlack'
});
let marker = L.marker( latlon, {icon:icon});
layers[areaType].addLayer( marker);
}
}
layers['volcanoes'] = L.layerGroup();
for( let volcano of globals['volcanoes']){
let name = volcano['name_jp'], latlon = volcano['latlon'];
if( latlon==undefined){
continue;
}
let icon = L.divIcon({
html:"▲<br><ruby>" + name + "</ruby>",
iconSize: [80,30], iconAnchor: [40,10], className:'icon textWhite borderBlack'
});
let marker = L.marker( latlon, {icon:icon});
layers['volcanoes'].addLayer( marker);
}
layers['class20s'] = {};
getDetailedPolygons();
}
document.getElementById("elem").addEventListener("change",function(e){
getDetailedPolygons();
});
// 移動時
map.on('moveend', function(){
getDetailedPolygons();
});
function getDetailedPolygons(){
let promises = [];
let zoom = map.getZoom(), bounds = map.getBounds();
if( 8<=zoom){
for( let i in globals['areaLimits']){
if( (globals['areaLimits'][i]['sw'][0]<=bounds['_northEast']['lat'] && bounds['_southWest']['lat']<=globals['areaLimits'][i]['ne'][0]) && (globals['areaLimits'][i]['sw'][1]<=bounds['_northEast']['lng'] && bounds['_southWest']['lng']<=globals['areaLimits'][i]['ne'][1])){
if( globals['class20s'][i] == undefined){
promises.push(
new Promise((resolve, reject) => {
fetch("https://www.jma.go.jp/bosai/common/const/geojson/class20s_" + [i] + ".json")
.then((response) => response.json())
.then((areas) => {
globals['class20s'][i] = areas;
layers['class20s'][i] = L.layerGroup();
let polygons =
L.geoJSON(globals['class20s'][i], {
style:{color:'#005aff'}
}).bindPopup(function (layer) {
const areaCode = layer.feature.properties.code;
if( globals['areas'][areaType][areaCode]==undefined){
return layer.feature.properties.name;
}else{
return globals['areas']['class20s'][areaCode]['name'];
}
});
layers['class20s'][i].addLayer( polygons);
for( let feature of globals['class20s'][i]['features']){
let areaName = feature['properties']['name'], areaCode = feature['properties']['code'];
if( globals['areas']['class20s'][areaCode]!=undefined){
areaName = globals['areas']['class20s'][areaCode]['name'];
if( globals['areas']['class20s'][areaCode]['kana']!=undefined){
let kana = globals['areas']['class20s'][areaCode]['kana'];
areaName = "<ruby>" + areaName + "<rt>" + kana + "</rt></ruby>";
}
}
let latlon = globals['areaCenters']['class20s'][areaCode];
let icon = L.divIcon({
html:areaName,
iconSize: [100,30], iconAnchor: [50,10], className:'icon textWhite borderBlack'
});
let marker = L.marker( latlon, {icon:icon});
layers['class20s'][i].addLayer( marker);
}
resolve( i);
});
})
);
}
}
}
}
Promise.all(promises).then((values) => {
controlLayers();
});
}
function controlLayers(){
let elem = document.getElementById("elem").value;
let zoom = map.getZoom();
console.log( {zoom});
for( let layerName of ['amedas','areaLimits','class10s','class15s','seaAreas','quakeAreas','tsunamiCoasts','volcanoes']){
if( elem==layerName){
if( !map.hasLayer(layers[layerName])){
map.addLayer(layers[layerName]);
}
}else if( map.hasLayer(layers[layerName])){
map.removeLayer(layers[layerName]);
}
}
if( elem=="areaCenters" && zoom<=6){
if( !map.hasLayer(layers['areaCenters']['centers'])){
map.addLayer(layers['areaCenters']['centers']);
}
}else if( map.hasLayer(layers['areaCenters']['centers'])){
map.removeLayer( layers['areaCenters']['centers']);
}
if( elem=="areaCenters" && 7<=zoom && zoom<=8){
if( !map.hasLayer(layers['areaCenters']['offices'])){
map.addLayer(layers['areaCenters']['offices']);
}
}else if( map.hasLayer(layers['areaCenters']['offices'])){
map.removeLayer( layers['areaCenters']['offices']);
}
if( elem=="areaCenters" && 9<=zoom){
if( !map.hasLayer(layers['areaCenters']['class20s'])){
map.addLayer(layers['areaCenters']['class20s']);
}
}else if( map.hasLayer(layers['areaCenters']['class20s'])){
map.removeLayer( layers['areaCenters']['class20s']);
}
for( let i in layers['class20s']){
if( elem=="class20s" && zoom>=8){
if( !map.hasLayer(layers['class20s'][i])){
map.addLayer(layers['class20s'][i]);
}
}else if( map.hasLayer(layers['class20s'][i])){
map.removeLayer(layers['class20s'][i]);
}
}
}
</script>
</body>
</html>